LGV Nord: Paris - Calais (France)

Hok(k)aido Shinkansen (Japan)

Or we could ask for something new.
For the UK I'd like to propose the C2C route from Fenchurch Street all the way the Shoeburyness (and the MoD site).
It's practically self contained and would be within the route length limitations at 39.5 miles...

All the routes sugested are very nice,but I would like to see the isle of wight railway as it was in the 1950s I know it's steam and they have not been made yet.
So it's an island with only two types of steam locos used in the 1950s the Adams class 02 0-4-4t tank loco and the William Stroudley E1 0-6-0t tank loco.
Being an island it can't be extended so people can't say just go to next station which you do get sometimes in some routes.
If there are no steam engines made diesels can be used and other stock can be made by dtg,or if the editor is released then by third party.